// Copyright 2013 Ronald Schlenker, www.technewlogic.de.
// 
// This file is part of Byond.
// 
// Byond is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 2 of the License, or
// (at your option) any later version.
// 
// Byond is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
// 
// You should have received a copy of the GNU General Public License
// along with Byond.  If not, see <http://www.gnu.org/licenses/>.

using System;
using System.IO;
using Byond.Frontend;
using Ionic.Zlib;
using Jacobi.Vst.Core;
using Jacobi.Vst.Framework;
using Byond.Logging;
using Byond.Persistence;
using NLog;
using Utils.Messaging;

namespace Byond.Vst
{
	class PluginPersistence : IVstPluginPersistence
	{
		private readonly IDocumentManager _documentManager;
		private readonly ByondPluginInfo _pluginInfo;
		private readonly PersistenceManager _persistenceManager;
		private readonly IUserLogger _userLogger;
		private readonly Logger _logger;

		public event MessageEventHandler SendMessage;

		public void ReadPrograms(Stream stream, VstProgramCollection programs)
		{
			try
			{
				_logger.Info("VST Plugin Persistence restoring programs...");

				var buffer = new byte[stream.Length];
				stream.Read(buffer, 0, (int)stream.Length);
				var json = DeflateStream.UncompressString(buffer);

				_persistenceManager.RestoreAndRunEnsemble(json);
			}
			catch (Exception e)
			{
				_userLogger.Log("Could not restore: " + e.Message);
			}
		}

		public void WritePrograms(Stream stream, VstProgramCollection programs)
		{
			_logger.Info("VST Plugin Persistence WritePrograms called...");

			// TODO: Soll das so sein?
			_documentManager.SaveAll();

			if (!_persistenceManager.ShouldPersistCurrentState)
				return;

			var json = _persistenceManager.PersistCurrentStateToJson();
			var buffer = DeflateStream.CompressString(json);

			stream.Write(buffer, 0, buffer.Length);
		}

		public bool CanLoadChunk(VstPatchChunkInfo chunkInfo)
		{
			return chunkInfo.PluginID == _pluginInfo.PluginID;
		}
	}
}